National Geographic 4D Imperial China PuzzleNational Geographic Imperial China is the worlds first multi layer Jigsaw Puzzle that teaches history with its interactive puzzle app! Learning about ancient China has never been so much fun. The first layer is a historical jigsaw map, which consists of approximately 600 puzzle pieces. The second layer contains model replica monuments and buildings such as The Great Wall of China, Mount Tai, and Tiananmen. Once assembly is complete, the history lesson